title: Electronic and geometrical manipulation of the excited state of bis-terdentate homo- and heteroleptic ruthenium complexes.
abstract: This work describes the synthesis and characterization of two new bis-terdentate Ru(II) complexes. Compound 1 is a homoleptic complex containing two CNC N-heterocyclic carbene (NHC) based ligands, whereas compound 2 bears one CNC ligand and an ancillary terpyridine ligand. The redox and photophysical properties of both compounds have been investigated and their X-ray crystal structures determined. Complex 1 displays a close-to-perfect octahedral coordination geometry and is not luminescent at room temperature while complex 2 features room temperature and 77 K luminescence despite its partially distorted geometry. The presence of the NHC moieties brings a significant amount of electronic density to the metal centre therefore lowering its oxidation potential with respect to that of analogous polypyridyl complexes.
authors.affiliation: Département de Chimie Moléculaire, UMR CNRS 5250, ICMG - FR 2607, Université Joseph Fourier, BP 53, 38041, Grenoble Cedex 9, France.
authors.forename: Joydev
authors.initials: J
authors.lastname: Dinda
authors.forename: Sébastien
authors.initials: S
authors.lastname: Liatard
authors.forename: Jérôme
authors.initials: J
authors.lastname: Chauvin
authors.forename: Damien
authors.initials: D
authors.lastname: Jouvenot
authors.forename: Frédérique
authors.initials: F
authors.lastname: Loiseau
mesh_terms: D000042:Absorption; D018360:Crystallography, X-Ray; D004563:Electrochemistry; D004583:Electrons; D009942:Organometallic Compounds / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013696:Temperature
chemical_list: D009942:Organometallic Compounds; D012428:Ruthenium